Why is ice white

When we look into the ice cubes, there is a white colored part in the middle(inside at the center). I google searched and most of them say it's the colour of the gases trapped inside when it froze.
But there are no white coloured gases inside. is there? lets take oxygen, its a colourless gas. CO2 , colourless........ etc.
So why is ice white?? is it due to the impurities inside it?

Removing soluble gases are in my opinion, more difficult than making the place a vacuum.

If you use a vacuum the water will boil and freeze at the same time, you will end up with bubbles of water vapor. Better to start in an environment pressurized with only water vapor. Also, If you cool the sample too rapidly the outside surface will freeze before the center, thus trapping the water in the center and creating stress as the center freezes and tries to expand. This could result in stress fractures that would scatter light just like the bubbles did and cause a white appearance.